Ball — Notes on Some Western Willows. 83 



S. CHLOROPHYLLA Andcrsson. 



iS". chlorophylla Auderss., Monog. Sal. 138. /. 72. 18G7 (in part). — 

 Anderss. in DC. Prod. 16': 243. 1868 (in part). — Bebb, in Coult., Man. 

 Rocky Mt. Bot. 337. 1885. — Macoun, Cat. Canad. PI. 446. 1886 (in part). — 

 Nelson, Prel. Fl. Wyo. 179. 1894. 



S. chlorophylla var. pychnocarpa Anderss., Monog. Sal. 139. 1867. — And- 

 ers^. in DC. Prod. 162:244. 1868. 



It is intended that the above citations be taken as referring 

 to S. chlorophylla only in so far as they indicate the western or 

 Rocky Mt. form. The principal works treating of the North 

 Atlantic coast form are cited in a footnote* below. 



The story of the confusion of S . phylidfolia and S. chloro- 

 phylla is briefly this. — S. phylicifolia was long known in both 

 Europe and northern America. In 1867, Andersson, in his 

 monograph, restricted this name to the European plant and 

 named the American plant S. chlorophylla, making the latter 

 include all forms from the White Mts., Labrador, and the 

 west, except a single collection from the Saskatchawan R., 

 which he named var. pychnocarpa. Andersson's changes 

 were generally accepted until, in 1889, Mr. Bebb reported on 

 his study of Faxon's abundant collections in the White Moun- 

 tains. Mr. Bebb asserted that the plant of the White Mts. 

 and Labrador was identical with the European plant and hence 

 should bear the same name, 8. phylicifolia. Referring to 

 this eastern plant he makes the claim that " from a meeting- 

 ground of perfect similarity the American forms diverge not 

 more widely than do the European of the same species." He 

 does not mention the Rocky Mt. form and only remarks that 

 the Yuriety pychnocarpa presents most noticeably the charac- 

 ters of S. chlorojjhylla . 



Such Labrador specimens as I have seen are typical S. 

 phylicifolia, but the few White Mt. specimens examined, 

 though old and imperfect, present a decidedly American vari- 

 ation towards the Rocky Mt. form. It may be remarked that 

 the description in the lUus. Flora fits the New England plant 

 rather than the typical /S. phylicifolia of Labrador or Europe. 



* S. phylicifolia L., Carey in Gray, Man. Bot. 428. 1848 (ed. 1). — Bebb, 

 Bull. Torn Bot. Club 16:53. 1889.— Bebb in Gray, Man. Bot. 484. 1890 

 <ed. 6). — Britton & Brown, Illus. Fl. 1 : 502. /. 1195. 1896. 



S. chlorophylla Anderss. 1. c. (loc. White Mts.). — Gray, Man. Bot. 464. 

 1868 (ed. 5). 



